Preheat oven to 250°.,Cook sugar, margarine, corn syrup and salt in saucepan, stirring constantly, until it bubbles.,Cook for 5 minutes without stirring.,Remove from heat; add soda and vanilla.,Place corn in,a large roaster pan.,Pour syrup over and stir well.,______,Stir 2 or 3 times during baking.,Remove from oven and cool.,Separate while cooling.,Many servings.